/Engine/Plugins/Runtime/Metasound/Source/MetasoundEngine/Public/MetasoundBuilderSubsystem.h
Returns the base MetaSoundUClassthe builder is operating on (ex. MetaSoundSource, MetaSoundPatch, etc. not to be confused with the underlying document builder's MetaSound class type)
virtual const [UClass](API\Runtime\CoreUObject\UObject\UClass) & GetBuilderUClass() const